electromagnetic spectrum
DESCRIPTION
Electromagnetic Spectrum. Discovering Invisible Light LAB adapted from GEMS Becky Hedstrom Feb 2012 . Light Sources. What are some other sources of light energy that we can see?. Light Sources. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/1.jpg)
Electromagnetic Spectrum
Discovering Invisible Light
LAB adapted from GEMS
Becky Hedstrom Feb 2012
![Page 2: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/2.jpg)
Light SourcesWhat are some other sources of light energy that we can see?
![Page 3: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/3.jpg)
Light SourcesHow can we define something as a SOURCE of light??
![Page 4: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/4.jpg)
Sources*must generate and emit (give off) the light themselves.
*glow and give off their own light.
Example: Stars, including our Sun, are sources of light
![Page 5: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/5.jpg)
Light SourcesWhile most objects reflect (or bounce back) light to some degree. They are NOT considered to be the source of that light themselves. Example: The moon reflects the light of the sun- that’s how how we are able to see it. But the moon is NOT a source of light itself
![Page 6: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/6.jpg)
Light DETECTORSWhere are some light detectors in this room?
Are there any others light detectors that you can think of?
How about the ones located a few centimeters below your eyebrows? : )
![Page 7: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/7.jpg)
Light TransmittersSome materials allow visible light through are called transmitters. There are 3 qualities of transmitters:
TRANSPARENT - allows visible light to transmit, or pass through, clear enough to be seen through TRANSLUCENT - admitting and diffusing light so that objects cannot be seen clearly; only partly distinguishedOPAQUE - NOT transmitting or allowing light to pass through.
![Page 8: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/8.jpg)
Light SHIELDSHow can we define something as a SHIELD of light?Any materials that do not let light waves or particles pass through
Example: Aluminum foil would be a “SHIELD that works” for visible light - like this flashlight.
![Page 9: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/9.jpg)
Light TRANSMITTERSWhat are some other things that DON’T shield light, - instead allowing the transmission of visible light?
transmit = let light waves or particles pass through)
Examples: clear glass, clear plastic, water, oil
![Page 10: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/10.jpg)
Light TransmittersSome materials allow visible light through are called transmitters. There are 3 qualities of transmitters:
TRANSPARENT - allows visible light to transmit, or pass through, clear enough to be seen through TRANSLUCENT - admitting and diffusing light so that objects cannot be seen clearly; only partly distinguishedOPAQUE - NOT transmitting or allowing light to pass through.
![Page 11: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/11.jpg)
Besides visible energy we see in this room- INVISIBLE energy is all around us!
![Page 12: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/12.jpg)
Stations #1 - #6 each with 1. a SOURCE of energy, 2. a DETECTOR of that energy, and 3. a set of different materials to
test/identify as energy TRANSMITTERS or SHIELDS to see which materials may be able to block the invisible energy
![Page 13: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/13.jpg)
STATION 1
VISIBLE LIGHT SOURCE
(flashlight)
STATION 1 VISIBLE LIGHT
DETECTOR
(white paper) is being called the detector because it reflects the light and thus allows our EYES to see it
So our EYES are really DETECTORS : )
![Page 14: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/14.jpg)
INVISIBLE LIGHT WORKSHEET record Predictions and Observations TEST
SHIELDFLASHLIGHTSTATION 1Visible Light
BLACK LIGHTSTATION 2Ultra violet
Clearplastic
Pred / T / / T Result
Pred, / / / Result
Black Plastic
Pred. / S / / Result
Pred, / / / Result
Arrival at new station:MARK PREDICTIONS * on Left side of Station Row
7-10 min. at each station
* KEY
S = Shield
T = Transmitter
HANDLE all items GENTLY!Try folding materials into several layers
VOICES:LOW VOLUME
Auditory Cue signals
ROTATION to Next higher #(#7 go to #1)
![Page 15: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/15.jpg)
Get ready for some surprises!
At Station #1 VISIBLE LIGHT , making predictions about which materials transmit light, and those which block light is fairly easy – but not so much, with invisible energies! Travel with Lab sheets and pencils as groups and
have fun exploring!
![Page 16: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/16.jpg)
De-Briefing Station # 1 VISIBLE LIGHT SOURCE = flashlight
DETECTOR = white paper (used to reflect or bounce back the visible light so our eyes can identify it
DETECTORS Our EYES
![Page 17: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/17.jpg)
De-briefingStation # 2 INFRARED Energy
SOURCE = HEAT LAMP (infrared bulb)
DETECTOR = Students’ hands
(optional- Digital camera or video
camera)
![Page 18: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/18.jpg)
De-briefing Station # 3 Remote Control
SOURCE = Remote control DETECTOR = TV or overhead
projector or other device
triggered by remote
![Page 19: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/19.jpg)
De-BriefingStation # 4 RADIO STATION
(set to set to receive FM stations)
SOURCE = RADIO STATION DETECTOR = radio itself is a detector of radio waves received at FM frequencies- called Megahertz (MHZ or 106 ) 106 refers to cycles (peak to peak) per second
![Page 20: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/20.jpg)
RESULTS Station #5 RADIO
(set to set to receive AM stations) SOURCE = Radio station
DETECTOR = DETECTOR = radio itself is a detector of radio waves received at AM frequencies- called Kilohertz (KHZ or 10 3 ) 103 refers to cycles (peak to peak) per second
![Page 21: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/21.jpg)
DeBriefing RADIO Reception, cont’d.
While batteries are powered by energy source of batteries or electricity, producing sound energy our focus today is discovering the source/location – where are the signals coming from that convert to radio waves to provide the sound energy we can hear?
Yes- the source is a radio transmission tower- located at a distance. The information to produce sounds we hear on the radio is encoded in the waves transmitted from the radio tower.
The radio is the detector of radio waves.
![Page 22: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/22.jpg)
De-Briefing Station # 7 X-RAY Energy and
#8 GAMMA RAY Energy # 7 #8
X RAY GAMMA RAY
SOURCE = x ray machine generated by cosmic objects
Sun gives off x-rays during and radoiactive atoms, also
solar flares in nuclear explosions DETECTOR = Geiger counter
![Page 23: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/23.jpg)
SUMMARIZING LIGHT Energy can be both VISIBLE and INVISIBLE:
1. Name of invisible light used in remote control device?
2. What kind of invisible energy do we cook with?
3. What kind of waves are received by satellite TV dish?
4. On a trip to dentist, lead shield aprons protect from radiation of vital organs from what type of energy?
5. What kind of energy is invisible to humans, but can be seen by some animals?
![Page 24: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/24.jpg)
SUMMARIZING (KEY) LIGHT Energy can be VISIBLE and INVISIBLE:
1. Name of invisible light used in remote control device?
infrared
2. What kind of invisible energy do we cook with?
microwave
3. What kind of waves are received by satellite TV dish?
microwaves
4. On a trip to dentist, lead shield aprons protect from radiation of vital organs from what type of energy?
X-ray
5. What kind of energy is invisible to humans, but can be seen by some animals? infrared
![Page 25: Electromagnetic Spectrum](https://reader036.vdocuments.us/reader036/viewer/2022062520/56815d88550346895dcb92d8/html5/thumbnails/25.jpg)
Electromagnetic Spectrum
Discovering Invisible Light
LAB adapted from GEMS
Becky Hedstrom Feb 2012